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| Number | Title | Issue Date |
| 8089784 | Synchronous rectifier This invention relates to a synchronous rectifier for LLC resonant converter. This method allows simple drive method for the synchronous rectifier MOSFETS by using the transformer secondary winding voltage and one-shot vibrator. The synchronous rectifier MOSFETs are... | 01/03/2012 |
| 8068355 | Apparatus for isolated switching power supply with coupled output inductors A multiphase DC-to-DC power converter has two or more sets of input switches, each set of input switches driving primary windings of at least one associated transformer. Each transformer has one or two secondary windings, the secondary windings feeding power through... | 11/29/2011 |
| 7944716 | Control of a resonant converter The invention deals with the control of a resonant LLC converter by use of control parameters. The primary current flowing in the resonant tank and a voltage at a predetermined point in the resonant tank are monitored and control parameters are set for a high side c... | 05/17/2011 |
| 7929321 | Depletion mode trench MOSFET for improved efficiency of DC/DC converter applications A DC-to-DC converter includes a high-side transistor and a low-side transistor wherein the high-side transistor is implemented with a high-side enhancement mode MOSFET. The low side-transistor further includes a low-side enhancement MOSFET shunted with a depletion m... | 04/19/2011 |
| 7872883 | Synchronous buck power converter with free-running oscillator In one embodiment, a power converter system includes a switching circuitry having a plurality of switches operable to be turned on and off to cause current to flow to deliver power to a load. A driver circuitry is responsive to an oscillation signal and generates co... | 01/18/2011 |
| 7859866 | Controller IC, DC-AC conversion apparatus, and parallel running system of DC-AC conversion apparatuses A DC power source voltage is supplied to a center tap of a primary winding, and first and second semiconductor switches alternately turned on are disposed between each of both ends of the primary winding and a common potential point, and a current flowing through a ... | 12/28/2010 |
| 7760522 | Control unit for controlling DC/DC converter, DC/DC converter, electric apparatus, and apparatus having supply circuit The present invention is intended to prevent the flow of a large input current into a DC/DC converter, to which power is fed from a power supply, before a supply voltage delivered from the power supply reaches a rated output voltage. A control unit included in the D... | 07/20/2010 |
| 7630220 | High frequency power supply A high frequency power supply includes a DC source unit (19) that outputs a DC voltage Vdc having an output level corresponding to a target voltage, an oscillation unit (13) that outputs a high frequency voltage signal having an output level correspond... | 12/08/2009 |
| 7626834 | Double ended converter with output synchronous rectifier and auxiliary input regulator A DC to AC power converter is disclosed. The power converter has four power-switching devices, two diodes, a step-up and isolation transformer, a capacitor-choke filter and a controller. Two power-switching devices located on the primary side of the transformer are ... | 12/01/2009 |
| 7599199 | Power converter switch control A power converter includes a transformer having a primary winding and a secondary winding, and a plurality of switches coupled to the primary and secondary winding, the plurality of switches responsive to at least one control signal to short both the primary and sec... | 10/06/2009 |
| 7583520 | Direct-current converter A direct-current converter includes a high-frequency converting circuit converting voltage of a direct-current power source to alternating-current voltage, a transformer having primary and secondary windings P, S and a rectification smoothing circuit rectifying and ... | 09/01/2009 |
| 7573731 | Active-clamp current-source push-pull DC-DC converter Provided is a current-source push-pull DC-DC converter using an active clamp circuit for reusing energy of leakage inductances by not only diodes on a secondary side of a transformer being zero-current switched using a series-resonant full-wave rectifier, but also t... | 08/11/2009 |
| 7471524 | Isolated DC-DC converters with high current capability A DC-to-DC converter having a transformer with a primary and a tapped secondary, two serial output filter inductors connected parallel with the secondary, a center output filter inductor connected between the secondary tap and serial output inductors, two serially c... | 12/30/2008 |
| 7463498 | Apparatus for isolated switching power supply with coupled output inductors A multiphase DC-to-DC power converter has two or more sets of input switches, each set of input switches driving primary windings of an associated transformer. Each transformer has one or two secondary windings, the secondary windings feeding power through output sw... | 12/09/2008 |
| 7400064 | DC/DC power converter A switching regulation system and control scheme efficiently enables driving multiple loads from a common energy storage element, such as an inductor. The control scheme operates to store energy in the energy storage element over a first portion of a cycle, such as ... | 07/15/2008 |
| 7394671 | Controller IC, DC-AC conversion apparatus, and parallel running system of DC-AC conversion apparatuses A DC power source voltage is supplied to a center tap of a primary winding, and first and second semiconductor switches alternately turned on are disposed between each of both ends of the primary winding and a common potential point, and a current flowing through a ... | 07/01/2008 |
| 7394209 | Liquid crystal display system with lamp feedback A liquid crystal display system and CCFL power converter circuit is provided using a high-efficiency zero-voltage-switching technique that eliminates switching losses associated with the power MOSFETs. An optimal sweeping-frequency technique is used in the CCFL igni... | 07/01/2008 |
| 7368880 | Phase shift modulation-based control of amplitude of AC voltage output produced by double-ended DC-AC converter circuitry for powering high voltage load such as cold cathode fluorescent lamp A double-ended, DC-AC converter supplies AC power to a load, such as a cold cathode fluorescent lamp used to back-light a liquid crystal display. First and second converter stages generate respective first and second sinusoidal voltages having the same frequency and... | 05/06/2008 |
| 7365997 | Synchronous switching control circuit for power converters The present invention provides a synchronous switching control circuit for variable switching frequency power converters. It comprises a first circuit to generate a first signal in response to an input synchronous signal of a power converter. A second circuit is cou... | 04/29/2008 |
| 7365451 | Power converter A power converter that can continue to operate after suffering a partial failure. The power converter includes multiple array transformers; normally-on switches connected respectively in series with the ends of each of the primary windings of the array transformers;... | 04/29/2008 |
| 7362077 | Pre-charge method for isolated boost converter A boost control module operates semiconductor switches of a boost converter circuit in an avalanche mode to precharge a boost output capacitor. The boost control module comprises a switching module that complementarily transitions a first semiconductor switch and a ... | 04/22/2008 |
| 7355354 | Method for starting a discharge lamp using high energy initial pulse The described DC to AC inverter efficiently controls the amount of electrical power used to drive a cold cathode fluorescent lamp (CCFL). Additionally, during striking of the CCFL, a higher energy initial energy pulse is used. During normal operation, a lower energy... | 04/08/2008 |
| 7352596 | Method of operating a resonant push-pull converter in an above resonant frequency mode A method for operating a push-pull converter in an above resonant frequency operating mode, where the above resonant frequency operating mode produces a switching frequency that is higher than the natural operating resonant frequency of the converter circuit. As a r... | 04/01/2008 |
| 7342362 | Full-bridge soft switching inverter and driving method thereof A full-bridge soft switching inverter and a driving method thereof, using zero-voltage switching and conducting a circular current in a circuit including two n-channel MOSFET's so as to drive at least one load such as a cold cathode fluorescent lamp (CCFL) and a sig... | 03/11/2008 |
| 7327827 | X-ray high voltage device A semiconductor switch 12 connected in series with a smoothing capacitor 12 is constituted by connecting in parallel a diode 13D which permits to flow current regenerated from energy of electric charges stored in a high voltage capacitor 17 | 02/05/2008 |
| 7324355 | Dc-DC converter A DC-DC converter is provided which includes a switching element, a choke coil, a flywheel diode, an output capacitor, a diode, and an auxiliary transformer having primary and secondary windings. The primary winding and the switching element constitute a first serie... | 01/29/2008 |
| 7310249 | Switching power supply circuit Enhancement of the power conversion efficiency and reduction of switching noise of a power supply circuit are achieved. The power supply circuit includes, on the primary side, a composite resonance type converter formed from a current resonance type converter and a ... | 12/18/2007 |
| 7310245 | Electric power transmission device and electric power transmission method In an electric power transmission device in which a primary side power transmission coil (L1) and a secondary side power receiving coil (L2) are magnetically coupled, and electric power is transmitted from the primary side power transmission coil (L... | 12/18/2007 |
| 7302282 | Communications system for implementation of synchronous, multichannel, galvanically isolated instrumentation devices An apparatus and method for synchronous communications using a serial data stream employs a housing with a controller and a back plane. The housing accepts one or more modules for interconnection with the back plane. The back plane distributes power to the modules a... | 11/27/2007 |
| 7286376 | Soft-switching power converter having power saving circuit for light load operations A soft switching power converter includes a first switch for switching a transformer to transfer energy. A second switch is equipped to switch energy in a capacitor to the transformer to achieve soft switching for the next switching cycle. A control circuit is coupl... | 10/23/2007 |
| 7282894 | Method and apparatus for performing lossless sensing and negative inductor currents in a high side switch A current sensing circuit for use in a switching regulator having a high-side switch. The current sensing circuit includes a first sensing circuit coupled to the high-side switch for measuring current flowing in a positive direction through the high-side switch. The... | 10/16/2007 |
| 7282900 | Performance controller for a step down current mode switching regulator A method of regulating an output voltage by utilizing a switching regulator, where the switching regulator includes a high side switch, a low side switch having an active diode, a controller coupled to the high side switch and the low side switch, and a current meas... | 10/16/2007 |
| 7274574 | Magnetically controlled transformer apparatus for controlling power delivered to a load with current transformer feedback A circuit with a magnetically variable transformer having primary and secondary windings wound on a magnetic core wherein the transformer core with associated windings is placed in close proximity to an independently wound control coil. The transformer core is place... | 09/25/2007 |
| 7271546 | Lighting device for dielectric barrier discharge lamp This invention aims to decrease the leakage current of a dielectric barrier discharge lamp, and to prevent generation of the luminance slope between both electrodes. Electrodes 3 and 4 are formed in the outer surface of the dielectric barrier discharge... | 09/18/2007 |
| 7253594 | Reducing power/area requirements to support sleep mode operation when regulators are turned off A single sleep mode controller which ensures that there is at least a corresponding minimum voltage level across capacitors when the corresponding regulators are turned off. In an embodiment, the sleep mode controller uses a single comparator which compares the volt... | 08/07/2007 |
| 7242153 | Pulse width modulation inverter circuit and control method thereof A pulse width modulation inverter circuit is provided. The circuit includes a power switch driver, a power switch, a transformer unit, a feedback detector unit, and a voltage control oscillator. The circuit is electrically coupled to the DC power source to drive a l... | 07/10/2007 |
| 7239530 | Apparatus for isolated switching power supply with coupled output inductors A multiphase DC-to-DC power converter has two or more sets of input switches, each set of input switches driving primary windings of an associated transformer. Each transformer has one or two secondary windings, the secondary windings feeding power through output sw... | 07/03/2007 |
| 7239043 | Power conversion apparatus and methods using an adaptive waveform reference A power conversion apparatus, such as a UPS, includes a first waveform reference signal generator circuit operative to generate a first waveform reference signal responsive to an AC bus, and a second waveform reference signal generator circuit operative to generate ... | 07/03/2007 |
| 7235932 | High efficiency ballast for gas discharge lamps An electronic ballast for a gas discharge lamp includes an adjustable constant current source circuit adapted to convert a direct current input to provide an initial start current and a variably controlled constant current. A coupling transformer circuit is connecte... | 06/26/2007 |
| 7233645 | Systems and methods for controlling an X-ray source A control system for an X-ray source includes a sensor interface for receiving one or more sensor signals representative of operation of the X-ray source; a programmable controller operative in response to the one or more sensor signals and a sequence of control ins... | 06/19/2007 |
